Annubar Flow Meter

Annubar Flow Meter

Annubar Flow Meter is a no-equal solution with a patented, averaging pitot tube that delivers superior measurement accuracy over a wide flow range. This flow meter can measure multiple variables and is engineered with an integrated thermowell for temperature measurement. Its patented T-shaped sensor is capable of obtaining measurements via a single pipe penetration while maintaining a small profile in the pipe to reduce permanent pressure loss and increase energy savings.

NO.SI-Annubar Flow Meter
PaymentT/T, Paypal
Product OriginShaanxi, China
Shipping PortShanghai/Ningbo/Shenzhen
Lead Time3-5 days after payment received

Annubar flowmeter

Process connectionModelDN mmSend
Standard typeNormalLNNL50-200RFQ
Tube flange typeNormalLNNLF50-200
Overall welding typeNormalLNNLH50-200

Integration annular flowmeter

Standard typeNormalLNNLY50-200Send
Tube flange typeNormalLNNLYF50-200
Overall welding typeNormalLNNLYH50-200
Operation temperature≤550℃, up to 1000 ℃
Reynolds numberRed=3000 ~ 1×107
Medium viscosityμ≤30mPa s
Range ratio4:1 (10:1 if differential pressure satisfied)
Accuracy±1.0%, ±1.5%
Pressure loss≤0.03
Straight-line lengthUpstream L1=5D, downstream L2=2D
Suitable mediumLiquid, gases, steam


Annubar Flow Meter can be applied to a variety of fluids (gas, liquid, steam). The diameter of the pipe is from DN50 to DN9000 (mm), the upper limit of pressure can reach 40MPa, and the upper limit of temperature is 1000°C.


Average speed tube + three valve group + temperature pressure compensation + transmitter, form an integrated structure, easy to use.
For the unavoidable clogging problem of similar products in measuring dirty media, achieve non-stop production maintenance.


T-shape Annubar creates a fixed separation point for DP signal improvement over a wider flow rate.
The T-shape design of averaging pitot tube ensures very low permanent pressure loss.

Gas Measurement

In one application Annubar measurement gas, comprising the steps, at the installation of the pipe above the mounting base and an isolation valve, the isolation valve and then through the openings in the pipeline installation and integration Annubar ; the orifice flowmeter having T-shaped cross-sectional configuration attempts to prevent the working fluid medium to produce a high pressure region in front of the flat orifice, particulate impurities in the fluid is deflected to bypass the high pressure zone, and a flat rear surface low-pressure displacement pressure stagnation zone opening; correct average velocity of the fluid within the conduit in the pipe cross uneven distribution of surface velocity, orifice flowmeter front of the high-pressure side pressure tap groove structure, the fluid is obtained.


The measurement of Crude Oil and Viscous fluids requires rugged and reliable metering equipment. While high viscosity flow measurement proves to be difficult for most flow meters, Annubar flow meter provides a solution for metering flow rates of viscous products up to 1,500,000 SSU.

  • Gas delivery and liquid delivery.
  • Energy research, steam boiler heart rate, pump efficiency.
  • Gas compressor efficiency and fuel consumption.
  • Process control: input and output, ratio, balance; cooling water or air, steam heating.
  • Feeding in the chemical industry.
What is an annubar flow meter?

Annubar flow meter is sometimes referred to as Averaging pilots and contain multiple pressure tappings to ‘average’ the flow; this is to try to compensate for a non-ideal flow profile.
The averaging pitot tube is inserted across the pipe as shown below. One side of the bar has pressure taps facing the flowing fluid that are coupled into an “averaging” chamber that measures the total (i.e. static + dynamic) pressure of the fluid.

What are the different types of flow measurement technique?

There are numerous types of flow meters depending upon the application, the specific fluid and the construction, including materials, of the flow meter. The 5 basic classifications of flow meters include:
1. Differential Pressure Flow Meters
Differential pressure flow meters measure the differential pressure across an orifice where flow is directly related to the square root of the differential pressure produced. There are also primary and secondary elements in differential flow meters. The primary element produces change in kinetic energy using either flow nozzle, pitot tube, orifice plate, or venturi flow meters. The secondary element measures the differential pressure and provides the signal.
Differential pressure meters represent around 1/5 of all flow meters around the world. They are commonly used in the oil & gas industry, along with HVAC, beverage, water, pharma, mining, paper and chemical applications.
2. Positive Displacement Flow Meters
Positive displacement (PD) flow meters measure the volume filled with fluid, deliver it ahead and fill it again, which calculates the amount of fluid transferred. It measures actual flow of any fluid while all other types of flow meters measure some other parameter and convert the values into flowrate. In PD flow meters, output is directly related to the volume passing through the flow meter. PD flow meters include piston meters, oval-gear meters, nutating disk meters, rotary vane type meters, etc.
Positive displacement flow meters are known for their accuracy. They are commonly used in the transfer of oils and fluids, like gasoline, hydraulic fluids as well as in-home use for water and gas applications.
3. Velocity Flow Meters
Velocity meters measure velocity of the stream to calculate the volumetric flowrate. These are less sensitive when the Reynolds number of fluid is higher than 10000. Velocity flow meters include turbine, paddlewheel, vortex shedding, electromagnetic and sonic/ultrasonic flow meters.
4. Mass Flow Meters
Mass flow meters are more effective in mass related processes as they measure the force that results from the acceleration of mass. More specifically, the force is measured as the mass moving per unit of time, instead of the volume per unit of time. Mass flow meters include Coriolis mass meters and thermal dispersion meters.
Typical applications for mass flow meters are tied to chemical processes. In addition to the chemical and gas industries, typical industries using mass meters include pharma, power, mining and wastewater.
5. Open Channel Flow Meters
Measurement of liquid in open channels include v-notch, weirs and flumes. These dam-like structures, or overflows, allow for a limited or concentrated free-flow of liquids based on the unique shape and size of the structure. This type of flow meter allows for a reading of the flowrate to be calculated.
Common applications of open channel meters include free flowing liquids like streams, rivers, irrigation channels and sewer/watewater systems.

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